From the sum of 2x2-xy+y2 and -2y2+x2–2xy subtract the sum of y2-x2+xy and -
y2+4xy+2x2
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Explanation:
add
2x²-xy+y² y²-x²+xy
+ x²-2xy-2y² +y²+2x²+4xy
_________. __________
3x²-3xy-y² 2y²+x²+5xy
subtract
3x²-3xy-y²
- x²-5xy-2y²
_________
2x²-8xy-3y²
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